Fixes DynamicCache export issues due to control flow and inplace modifications (#36652)
* Remove unnecessary masked_fill in deberta models
* Enable some code when exporting but not compiling
* add missing import
* style
* replace if by torch.cond
* style
* use numel
* style
* add unit tests
* style
* change empty value for dynamic cache
* replace != [] by numel()
* fix import issue
* style